docs: def headinside(self):
          """The head inside the well
          
          Returns
          -------
          array (length number of screens)
              Head inside the well for each screen
              
          """
          
          h = self.model.head(self.xw + self.rw, self.yw, layers=self.layers)
          return h - self.resfac * self.parameters[:, 0]